Xuanxin WU 氏 (共同発表者：Akitaka YAMADA氏)
“Acquisition of Standard Chinese Neutral Tone under Variation Theory: A comparison of Beijing Mandarin speakers and Cantonese speakers”
Misato IDO
“The Hidden Side of Exclusive Focus Particles: An Analysis of dake and sika in Japanese” Gengo Kenkyu 160, pp.183-213 (Sep., 2021), co-authored with Yusuke KUBOTA.